Lined carton



y 1950 J. w. wlLs fN 2,516,820

LINED CARTON med Dec. 2a, 1946 INVENTOR.

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ATTbRNEYS.

. end and dispose Patented July 25, 1950 UNITED STATES PATENT OFFICELINED CARTON John W. Wilson, Middletown, Ohio, assignor to TheInterstate Folding Box Company, Middletown, Ohio, a corporation oi OhioApplication December 26, 1946, Serial No. 718,300

Claims. (01. 229-14) Packages comprisingan outer paperboard foldinscarton and an inner liner have come into widespread use for theprotection of various contents, mostly foodstuifs. The carton is usuallyof tubular form with enclosing body walls having closure flaps at theends of the body walls. The liner is a tubular structure of flexiblesheet material projecting beyond the body walls at one or both ends. Thewalls of the liner are adhered to the body walls of the carton so thatwhen the carton is squared up or erected the liner is likewise squaredup and hence opened for filling.

In the preferred type of package, the liner has already been closed atthe bottom, forming a bag. But since the closed bag end projects beyondthe body walls, it is necessary to fold the projecting it within theconfines of the carton cross-section before the carton flaps can beclosed. This is time-consuming and inconvenient if done by hand; and ifdone by machine it requires a duplication of apparatus elements or aduplication of the use of folding elements provided for the top of thepackage.

The primary object of this invention is the provision of a lined,four-panel carton, the liner having a closed end, and the parts of thestructure being so related that the act of squaring up the cartonproduces an automatic folding of the closed liner end.

This and other objects of the invention which will be set forthhereinafter or will be apparent to one skilled in the art upon readingthese specifications, I accomplish by that structure and arrangement ofparts of which I shall now describe certain exemplary embodiments.Reference is made to the accompanying drawings, wherein:

Figure l is a plan view of a carton blank with which a liner isassociated.

Figure 2 is a plan view of the liner itself. Figure 3 is a plan view ofthe tubes lined carton. Figures 4, 5 and 6 are partial perspective viewsshowing stages of erecting the carton, and the action which thereuponensues automatically.

Figure 7 is a partial'perspective view showin a the fully erected cartonand the fully folded liner end.

Figure 8 is a plan view of a liner of somewhat modified form.

In Figure 1, I have shown a carton having body walls I, 2, 3, and l anda glue flap 5. Short flaps 6 and I have been shown at the ends of thebody walls I and 3, while the body wall 2 carries a tuck flap 8. Thisflap arrangement is exemplary only. Others may be employed including thewell known seal-end flap construction at one or both ends of thecartons.

A liner 5 is indicated as positioned on the carton blank in such a waythat the carton may be tubed about it, as by folding over the walls 4and I and adhering the glue flap 6 to the free edge of the wall I. Theliner 9 is a tubular member made of any suitable flexible sheetmaterial. The liners hereinafter described may be cut from sheets andindividually tubed, or as is preferable, the flexible material in stripform may be tubed about a former with an appropriate, adhesivelysecured, longitudinal seam. The bag tube thus formed will be cut apartinto suitable lengths.

My lining structures are closed at one end, which may be done by theapplication of adhesive, or the heat sealing of a thermoplasticsubstance constituting or carried as a coating by the flexible material.

For methods and means for forming liners and for associating them withcartons, reference may be made to the following patents: Re. 20,789,2,099,257, 2,114,621, and 2,166,388. The procedures there outlined maybe followed by me with only such changes as are necessary to form theparticular shapes of end closures hereinafter described, and to cut theflexible material accordingly. My formed liners or bags may be combinedwith cartons in the usual ways. The walls of my liners will be adheredto the body walls of the cartons as is usual, with appropriate care tomake sure of proper adhesion adjacent the ends of the body walls nextthe closed end of the liner.

My lining structures, however, depart from those hitherto current in theart in that the seam forming the bottom closure in the flat tube i notrectilinear, but on the contrary is shaped or angular. The liner 9 isprovided with a closure seam II, which as shown is substantiallyrectangular in'conflguration with the legs of the angle located at about45 degrees to the longitudinal axis of the bag.

The liner will be associated with the carton in such a way that the endsof the liner closure seam come closely adjacent the ends of the bodywalls, as will be seen from Figures 1, 3, and 4.

when the structure. illustrated in these figures is erected or squaredup, a self folding action occurs in the liner. The liner seam will beginto kink or bend along one of the seam legs, as shown at il in Figure 5.As the squaring up action proceeds and the endportions of the liner comedown more nearly into a horizontal plane, a peak forms as most clearlyshown at l2 in Figure 6. The final condition of the liner is shown inFigure 7, where the peak has folded itself down, and all parts of theline end approach a horizontal plane. No portion of the liner extends beyond the cross sectional confines of the carton, and while the liner endmay depart to some extent from the horizontal plane, all end portions ofthe liner are in such a position that the flaps or end closure membersof the carton may be folded without any preliminary manipulation of theliner.

I explain the action which occurs in this way:

3 The angular seam ll constitutes a stiffening because of the adhesivejuncture of the liner walls to each other, and also because of theinterposition of added adhesive where that is used. The angular legs ofthe seam form a truss. As the two flattened corner portions of thecarton move apart, and as the opposite corner portions move toward'eaohother, the truss tends to resist this movement, until one or the otherof the legs of the truss bends or kinks as at H in Figure 5.

- I The liner may be made as at la in Figure 8 with the apex of theangle along the central longitudinal axis ii of the liner. In thisevent, it Ls unpredictable which of the legsvof the angular seam willbend first. Since in some machines it is desirable to have the peak I:of the liner lie always in one direction, I find that I can accomplishthis by moving the apex of the angular seam to one side of the centrallongitudinal axis I! of the liner. This is illustrated in Figures 1, 2,and 3. It results in a slight cocking of the angle and a greater lengthin one of the legs of the angle than in the other. In a liner so formed,the longer leg of the angle is eil'ec- -tively the weaker, and will bendfirst as at H.

Modifications may be made in my invention without departing from thespirit of it. Having thus described my invention in certain exemplaryembodiments, what I claim as new and desire to secure by Letters Patentis:

1. A carton having enclosing body walls in .flat tubular form incombination with a flat tubular liner having a' portion projectingbeyond the ends of said body walls, said liner adhered to said bodywalls so as to be erected when the carton is erected, the projectingportion of said liner havlng'a flat end closure seam consisting of' twosubstantially rectangularly related seams, the outor ends of saidclosure seam approaching the.

ends of said carton body walls and the apex portion of said seamextending outwardly away from the ends of said walls a sufllcientdistance to permit separation of said walls during the erection of thecarton without rupturing the liner.

2. A carton having enclosing body walls in flat tubular form incombination with a flat tubular liner having a portion projecting beyondthe ends of said body walls, said liner adhered to said body walls so asto be erected when the carton is erected, the projecting portion of saidliner having a flat and closure seam consisting of two substantiallyrectangularly related seams, the outer ends of said closure seamapproaching the ends of said carton body walls and the apex porticm ofsaid seam extending outwardly away from the ends of said walls asufllcient distance to permit separation of said walls during theerection of the carton without rupturing the liner, said seam having anangular formation and formed of straight seam sections intersecting inthe central portion of the liner to form an angle.

s. A carton having enclosing body walls in flat tubular form incombination with a flat tubular liner having a portion projecting beyondthe ends of said body walls, said liner adhered-"to said body walls soas to be erected when the carton is erected, the projecting portion ofsaid liner having a flat end closure seam consisting of twosubstantially rectangularly related seams. the outer ends of saidclosure seam approaching the ends of said carton body walls and the apexportion of said seam extending outwardly away from the ends oi saidwalls a suflicient distance to permit separation of said walls duringthe erection of the carton without rupturing the liner. said seam havingan angular formation and formed of straight seam sections intersectingin the central portion of the liner to form an angle, said angle beingsubstantially degrees. said carton having body walls of substantiallythe same width.

4. A carton having enclosing body walls in flat tubular form incombination with a flat tubular liner, saidliner adhered to said bodywalls so as to be erected when the carton is erected. saidliner havingan'end closure seam of nonrectilinear form, the ends of said closureseam approaching the tops of said carton body walls and remainingportions of said seam extending away from the tops of said walls asuflicient distance to permit separation of said walls during theerection of'the carton without rupturing the liner, said seam having anangular formation and formed of straight seam sections intersect ing inthe central portion of the liner to form an angle, said angle beingsubstantially 90 degrees, said carton having body walls of substantially'the same width, the apex of said angle lying to one side of the centrallongitudinal axis of said liner.

5. A knock-down carton comprising body walls in articulation in flat,tubularform, and a flat, tubular liner therein having aportionprojecting beyond the ends of said body walla-said projectingportion tapering from points at the edges of said ilat liner adjacentthe 'ends or said" walls to an intermediate point furthest removed fromthe ends of said body walls, the edges of said tapered portions beingsealed together to form a bottom seam-for said liner, and said linerbeing adhered to said body walls at least adjacent the ends thereof.

6. A knock-down carton having body walls in articulation in flat,tubular form, and a flat, tubular liner within said walls and adheredthereto at least adjacent the ends of said walls, said" liner having aportion projecting beyond the ends of said body walls and having abottom seam consisting of two substantially rectangularly related seamsmeeting beyond said walls, the additive dimensions of a part of saidprojecting portion being substantially equivalentto the distance betweencorresponding body walls of the carton when the carton is in erectediorm, whereby said part is pulled substantially into a plane includingthe ends of said body walls when said carton is erected, accompanied byautomatic folding of another part of said liner projecting portion.

JOHN W. WILSON.

ans-muons crrnn The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number liame Date 2,999,257 Bergstein Nov. 16,1937 2,323,505 Wilcox July 6, 1943 2,339,156 Davis Jan. 11, 19442,377,533 Waters June 5, 1945 2,381,026 Arthur Aug. '7, 1945

